This strategic plan is developed jointly by the ATLAS user community and the Physics Division at Argonne National Laboratory. This plan is a public document, hence available to the entire ATLAS user community, and is updated as the need arises. In practice, the community discusses this plan at regular ATLAS Users Workshops or community meetings. The most recent was held at the 2018 Low Energy Community Meeting on August 10, 2018. The user’s executive committee and ATLAS management then work together to incorporate the outcome of these workshops into the strategic plan.